大乘起信論義記 3.117

3.117

意熏習者，若就本而言，名為業識。通而論之，即前五種意也。以諸菩薩知一切法唯是識量，捨彼事識外計分別，既了唯心，趣理速疾，異前漸悟，故云乃至速趣涅槃也。

As for the perfuming of the manas: in terms of the fundamental, it is called the karmic consciousness; speaking generally, it refers to the aforementioned five kinds of manas. Because bodhisattvas know that all dharmas are nothing but consciousness, they abandon the external discrimination and conceptualization of that empirical consciousness; having realized mind-only, they advance toward the principle swiftly, differing from the prior gradual awakening. Therefore it says, down to "swiftly advance toward nirvāṇa."